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Fabrication of boron nitride nanosheets with silver nanoparticles via mussel-inspired chemistry
( Arup Kumer Roy ),김석준,인인식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Boron nitride nanosheet (BNNS) decorated with silver nanoparticles (AgNPs) was successfully synthesized via mussel-inspired chemistry of dopamine. AgNPs were decorated on PDA-BNNS through spontaneous reduction of silver cations by catechol moieties of PDA layer on BNNS, resulting in AgNP-BNNS with good dispersion stability. Incorporation of PDA on BNNS not only played a role as a surface functionalization method of BNNS but also provided a molecular platform for building-up much sophisticated two dimensional BNNS-based hybrid nanomaterials such as metal nanoparticle-decorated BNNS.
Conformers of Zwitterionic Glycine in Aqueous Phase
Manik Kumer Ghosh,최태훈,최철호 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.2
Zwitterionic glycine was investigated for its major conformers and their isomerizations in aqueous phase by QM/MM-MD. The rotameric barrier of zwitterionic glycine along C−C bond is approximately 2 kcal/mol higher than that of non-ionized one. It can be attributed to the strong electrostatic effects of zwitterion, which attracts water solvents more tightly. Unlike the previous quantum mechanical calculations, our QM/MM-MD found that only the gauche conformer as stable minima along the C−N bond rotation. Overall, the preferred conformers in real solution are different from those found with limited clusters, necessitating the use of QM/MM-MD.
Rony Kumer Saha,Chaodit Aswakul 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In this paper, we present numerous small cell base station, i.e. femtocell base station (FCBS), architectures based on the number of transceivers (e.g., single or dual transceiver) and operating frequency bands (e.g., microwave and millimeter wave bands) existing in a FCBS for serving control-plane and user-plane (C-/U-plane) traffic in indoor environments under both traditional C-/U-plane coupled architecture (CUCA) as well as prospective C- /U-plane separation architecture (CUSA). With a system level simulation of a multi-tier network, we evaluate the performances of these FCBS architectures in terms of control-plane, user-plane, and an aggregate C-/U-plane traffic capacities. The simulation results show that because of serving only U-plane traffic by a FCBS in CUSA, CUSA outperforms CUCA for a single transceiver based FCBS in terms of user-plane traffic capacity irrespective of operating frequency. However, the presence of dual bands at a dual transceiver based FCBS results in higher aggregate C-/U-plane traffic capacity than that of a single transceiver based FCBS. Finally, we discuss a number of strengths and weaknesses, viability challenges, and open issues of these FCBS architectures.
Rony Kumer Saha,Chaodit Aswakul 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In this paper, a multi-band, namely co-channel microwave and 60 GHz millimeter-wave bands, enabled femtocell base station (FCBS) architecture (MBFA) is proposed to address non-uniform and asymmetric traffic in 5G cellular mobile networks. All femtocells are deployed in a multi-storage building. For the co-channel microwave band, the interference between FCBSs and the macrocell base station is avoided using almost blank subframe based enhanced inter-cell interference coordination techniques. The coexistence of both bands architecture is studied, and the outperformance of millimeter-wave over co-channel microwave bands is shown in terms of system capacity and spectral efficiency. We analyze the use of MBFA to address non-uniform traffic and asymmetric traffic from splitting uplink/downlink as well as control-plane/user-plane. Finally, the outperformance of MBFA over the single band enabled FCBS architecture in terms of energy efficiency, system capacity, and spectral efficiency is shown.
Rony Kumer Saha,Chaodit Aswakul 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In this paper, we propose a technique for clustering, frequency reuse, and allocation to femtocells (FCs) deployed densely in a 2-dimensional (2D) space in urban environments to address the high capacity and spectral efficiency demands of 5G mobile networks. We model the 2D space to consist of a set of square-grid apartments with one FC per apartment. A region of exclusion (RoE) including a group of FCs over the space is formed based on satisfying an optimization constraint of a minimum aggregate interference per link between co-channel FCs of adjacent RoEs. The co-channel interference is modelled using the planar-Wyner model. The number of FCs within a RoE forms a cluster of FCs, and all FC clusters have the same size for a given constraint. We propose an adjacent channel interference avoided static resource reuse and allocation algorithm for FCs within each cluster where the whole system bandwidth is reused. For performance evaluation, we consider a floor of a multi-storage building as 2D space that consists of 5×5 squaregrid apartments, and a multi-tier network that consists of a macrocell, a number of outdoor picocells and indoor FCs on the floor. The almost blank subframe (ABS) based eICIC technique is used to avoid cross-tier interference between macro-tier and femto-tier. With a system level simulation, we demonstrate the number of clusters that can be formed for a given interference constraint and the outperformance of the proposed technique by manifold in terms of the capacity and spectral efficiency as compared to the conventional ABS based eICIC technique.
( Arup Kumer Roy ),김석준,인인식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The combination of bottom-up and top-down approaches from resorcinol and formaldehyde (RF) provided RF-based carbon quantum dots (CQD) applicable to bioimaging of cancer cells in vitro together with the antibacterial activity toward both on S. aureus and E. coli. after silver nanoparticle (AgNP) decoration.